Debunk claim:

There was no change of the name of state, only its shortened version has been registered in the UN. The term Czechia has much longer history: it has its roots in the 17th century and is used in English since the 19th century. // No evidence for further conspiracy theories given.

Documentation for the debunk

Additional information

This information is reported by European Values Think-Tank in Disinformation Review issue 35. The item is located at row number 32 in the report.